Class 8 Science - BIHAR
How Nature Works in Harmony
The chapter 'How Nature Works in Harmony' in Class 8 Science introduces Bihar Board students to the delicate balance existing within our environment. It explores ecosystems, the interdependence of plants, animals, and microorganisms, and natural cycles like the water, carbon, and nitrogen cycles. Students will learn how energy flows through food chains and food webs, maintaining ecological equilibrium. Understanding this chapter is crucial for board exams as it builds foundational knowledge in environmental science, carrying around 6 to 8 marks through objective, short answer, and application-based questions about conservation and natural balance.
Start Learning FreeKey Concepts
Ecosystem
A biological community of interacting living organisms and their physical environment, working together as a single unit.
Food Chain and Food Web
A food chain shows the linear transfer of energy from producers to consumers, while a food web is a complex network of interconnected food chains in an ecosystem.
Biogeochemical Cycles
The pathways through which essential chemical elements like water, carbon, and nitrogen circulate between living organisms and the physical environment.
Interdependence in Nature
The reliance of different species on one another for survival, such as plants providing oxygen and food for animals, and animals providing carbon dioxide and pollination for plants.
Ecological Balance
A stable state where the diversity of living species remains relatively constant and natural cycles function smoothly without disruption.
Important Formulas
Board Exam Info
In the Bihar Board Class 8 Science examination, this chapter typically carries about 6 to 8 marks. Questions usually include multiple-choice questions (MCQs), fill-in-the-blanks, short answer questions explaining food webs or ecological balance, and long answer questions on the importance of natural cycles.
Frequently Asked Questions
What is the difference between a food chain and a food web?
A food chain is a single straight-line path of energy transfer from one organism to another, whereas a food web consists of many overlapping and interconnected food chains in an ecosystem.
Why is the 10% law important in an ecosystem?
The 10% law states that only 10% of energy is transferred to the next trophic level, which explains why food chains rarely have more than four or five links due to energy loss.
How do human activities disrupt the harmony of nature?
Activities like deforestation, pollution, overfishing, and industrialization break natural cycles, destroy habitats, and lead to the extinction of various plant and animal species.
Learn How Nature Works in Harmony with Your AI Tutor
10 different ways to study this chapter. Free for 3 chapters per day.
Lecture
Key Points
Interactive
Quiz
Flashcards